F 450 4WD Super Duty V10-6.8L VIN D (2004)
Trailer Lighting Relay: Testing and Inspection
Trailer Tow Relay, Parking Lamp
"Ford service information indicates the Trailer Tow Parking Lamp Relay is within the Central Junction Box (CJB). However, related system testing
and the CJB wiring diagrams do not indicate that the relay is serviceable seperate from the CJB".
